Pick up mechanism

1. Technical Field

The present disclosure relates to pick up mechanisms, and more particularly, to a pick up mechanism for picking up workpieces arranged in a large density.

2. Description of Related Art

A pick up mechanism may be used to pick up workpieces, such as nuts in a container. The pick up mechanism picks up one nut and aligns the nut to a receiving hole of a housing, and releases the nut into the receiving hole. Then the pick up mechanism moves back to the container to pick up another nut. When the nuts are arranged in a relative larger density in the container, due to the inference of nuts between each other, the pick up mechanism may not pick up the nut correctly.

Therefore, there is room for improvement in the art.

The components in the drawings are not necessarily drawn to scale, the emphasis instead placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is an isometric view of an embodiment of a pick up mechanism.

FIG. 2 is a partially exploded, isometric view of the pick up mechanism of FIG. 1 .

FIG. 3 is an exploded, isometric view of the pick up mechanism of FIG. 1 .

FIG. 4 is a cross-sectional view of the pick up mechanism of FIG. 1 , taken along line IV-IV.

FIGS. 1 and 2 show an embodiment of a pick up mechanism 100 . The pick up mechanism 100 includes a pick up rod 10 , a buffering member 20 , a sleeve 30 , a pick up head 40 , and a resisting assembly 50 . The sleeve 30 is sleeved on the pick up rod 10 , the buffering member 20 is sleeved on the pick up rod 10 , and opposite ends of the buffering member 20 is resisted between the pick up rod 10 and the sleeve 30 . The pick up head 40 is assembled to an end of the pick up rod 10 , the resisting assembly 50 is sleeved on the pick up head 40 and configured for sliding along the pick up rod 10 to expose the pick up head 40 .

The pick up rod 10 is substantially in a cylindrically hollow structure, and includes an annular portion 11 , a first shaft portion 12 , a second shaft portion 13 , and a conduit portion 15 . The first shaft portion 12 and the second shaft portion 13 protrudes from opposite ends of the annular portion 11 coaxially. The conduit portion 15 is connected to an end of the second shaft portion 13 away from the annular portion 11 . Diameters of the annular portion 11 , the second shaft portion 13 , and the first shaft portion 12 decreases in that order. The pick up rod 10 axially defines an air conduit 17 (referring to FIG. 4 ). The air conduit 17 extends through the annular portion 11 , the first shaft portion 12 , the second shaft portion 13 , and the conduit portion 15 .

The buffering member 20 is sleeved on the second shaft portion 13 . The sleeve 30 is sleeved on the second shaft portion 13 , and forms a stepped portion 31 in an inner side opposite to the annular portion 11 . The buffering member 20 is resisted between the annular portion 11 and the stepped portion 31 . In the embodiment, the buffering member 20 is an elastic compression spring.

FIGS. 3 and 4 show that the pick up head 40 is fixedly sleeved on an end of the first shaft portion 12 away from the annular portion 11 . The pick up head 40 has a diameter greater than that of the first shaft portion 12 . The pick up head 40 axially defines a plurality of pick up holes 41 at an end surface. The plurality of pick up holes 41 communicates with the air conduit 17 of the pick up rod 10 .

The resisting assembly 50 includes a guiding seat 51 , a pair of guiding rods 53 , a pair of elastic members 55 , and a resisting member 57 . The guiding seat 51 is annular and fixedly sleeved on the first shaft portion 12 , and located between the pick up head 40 and the annular portion 11 . The guiding seat 51 axially defines a pair of fixing holes 511 . Each fixing hole 511 is cut through opposite ends of the guiding seat 51 , and includes a receiving portion 5111 and an extension portion 5113 on a bottom of the receiving portion 5111 . The extension portion 5113 has a diameter less than that of the receiving portion 5111 . An end of the guiding rod 53 is fixedly received in the extension portion 5113 , an opposite end of the guiding rod 53 forms a restricting portion 531 . In the embodiment, the guiding rod 53 is a screw rod. The pair of elastic members 55 is sleeved on the pair of the guiding rods 53 , and is partially received in the receiving portions 5111 of the pair of fixing holes 511 . The resisting member 57 includes a resisting portion 571 and a sleeving portion 573 . The resisting portion 571 is substantially in a cylindrical shape and slidably sleeved on the pick up head 40 . The sleeving portion 573 extends from a periphery of an end of the resisting portion 571 radially. The sleeving portion 573 defines a pair of extending holes 5731 corresponding to the pair fixing holes 511 . The pair of guiding rods 53 are received in the pair of extending holes 5731 . The restricting portion 531 blocks an end of the sleeving portion 573 away from the guiding seat 51 . The pair of elastic members 55 are sleeved on the pair of guiding rods 53 . Opposite ends of the guiding rod 53 respectively resist the guiding seat 51 and the resisting member 57 .

FIGS. 1 through 4 show that when in assembly, the buffering member 20 is sleeved on the second shaft portion 13 . The sleeve 30 is sleeved on the second shaft portion 13 and compresses the buffering member 20 between the annular portion 11 and the stepped portion 31 . The pick up head 40 is fixedly sleeved on the first shaft portion 12 , the guiding seat 51 is sleeved on the first shaft portion 12 and located between the pick up head 40 and the annular portion 11 . The resisting member 57 is slidably sleeved on the pick up head 40 . The pair of guiding rods 53 extend through the pair of extending holes 5731 and fixedly received in the pair of fixing holes 511 . The pair of elastic members 55 are sleeved on the pair of guiding rods 53 , and resisted between the resisting member 57 and guiding seat 51 .

When picking up a workpiece, the pick up head 40 is aligned to the workpiece, the resisting member 57 resists the workpieces surrounding the workpiece to be picked up. The pick up rod 10 drives the pick up head 40 toward the workpiece to be picked up. The guiding seat 51 is driven by the pick up rod 10 to compress the pair of elastic members 55 , thereby driving the pair of guiding rods 53 to move relative to the resisting member 57 . When the pick up head 40 contacts the workpiece to be picked up, the pick up rod 10 generates a negative pressure in the air conduit 17 , thereby enabling the pick up head 40 to pick up the workpiece. Due to the separate arrangement of the plurality of pick up holes 41 , the negative pressure may uniformly pick up the workpiece via the plurality of pick up holes 41 .

When the pick up head 40 picks up the workpiece, the resisting member 57 resists against the workpieces surrounding the workpiece to be picked up to prevent inference from the workpieces surrounding the workpiece to be picked up, thereby enhancing a pick up accuracy and a pick up efficiency of the pick up head 40 .

When the pick up mechanism 100 has an improved impact resistance, the buffering member 20 and the sleeve 30 may be omitted. The number of the elastic members 55 and the number of the guiding rods 53 may be one, or more than two. The resisting member 57 need not to sleeve the pick up head 40 , but shields the pick up head 40 .

Finally, while various embodiments have been described and illustrated, the disclosure is not to be construed as being limited thereto. Various modifications can be made to the embodiments by those skilled in the art without departing from the true spirit and scope of the disclosure as defined by the appended claims.